• Oxidation and Reduction Reactions

“This material has been developed as a part of  the Australian School Innovation in Science, Technology and Mathematics Project funded by the Australian Government Department of Education, Science and Training as a part of the Boosting Innovation in Science, Technology and Mathematics Teaching (BISTMT) Programme.”

• Refraction and Optical Fibres

• When light travels from one medium to another it changes speed.

• It also changes direction.

• Redox reactions in photosynthesis

• Cell respiration

• Photography

• Electrolysis: SALTS AND WATER

• Fireworks

• REDOX REACTIONS IN BLEACHES: H2O2    HClO  SO2

• Galvanic Cells

• LESSON 2

OXIDATION  AND REDUCTION

• REDOX =

  OXidation + REDuction

What is oxidation ?

OXIDATION IS DEFINED AS :

REDUCTION IS DEFINED AS :

    3: GAIN OF  ELECTRONS      

                 =REDUCTION

                   (GER)

• When is it a redox reaction ?

  What about this reduction reaction?

 2MnO4-(aq)+ 16H+ +10e- → Mn2+(aq)+ 8H2O(l)

   and this one?

  Cr2O72-(aq) + 14H+ +6e- → 2Cr3+(aq)+ 7H2O(l)

                 uncombined with other      

                 elements their  

                 oxidation number is

                their oxidation number 

                is the charge on the ion :

   Is  H2(g)    +   I2(g) →   2HI (g)   a redox reaction?

2)  Mg(s)  +  H2SO4 (aq)  →  MgSO4 (aq) + H2 (g)

…